window.onload = init;

function init() {
    externalLinks_init();
}

function externalLinks_init() {
    if (!document.getElementsByTagName) {
        return;
    }

    var links = document.getElementsByTagName('a');

    for (var i=0; i<links.length; i++) {
        var link = links[i];

        if (link.getAttribute('href') && link.getAttributeNode('class') && (link.getAttributeNode('class').value.search(/external/) >= 0)) {
            link.onclick = externalLinks_open;
            link.onkeypress = externalLinks_open;
        }
    }
}

function externalLinks_open(a) {
    window.open(this.href);
    return false;
}

/// pouze cislo ve spravnem CGF tvaru
function cgf_only(e)
{
    switch (e.keyCode) {
        case 8:
        case 9:
        case 13:
        case 46:
        case 116:
            return true;
            break;
    }

    var k = (e.which) ? e.which : e.keyCode;
    var r = !((k < 48 || k > 57) && (k < 35 || k > 40));

    return r;
}